Far from a lock, but someone on a preliminary pre-cut sort of a list.
It's more then Generation Next and MCMG, honestly. Having done the deepest dive on 2000s IWA Mid South of probably anyone ever, there's so many little Shelley gems in there, as a guy who got it remarkably fast. Also a delight whenever he popped up in PWG or wherever. Beyond that, he's up there with AJ as one of the best television workers in TNA history, which is both impressive and a little depressing. Once he's out of there, the KUSHIDA team is one of the most fun and reliable tag team acts of the last decade, and the career revitalization over the last eighteen months as a singles guy has seen him not only produce these great matches, but also do that with talent that is best described as "unrefined", if we're going to be nice about it, outside of the three match Jonathan Gresham series in 2019-20. It's not the career it seemed like he was going to have in 2004 and 2005, but becoming your generation's Bobby Eaton instead of your generation's Chris Jericho isn't the worst thing in the world. Hardly a disqualifying factor.
And outside of Roderick Strong, there's not a better or more prolific tag team wrestler to come out of that generation, and Shelley is probably more diverse than Roddy in that regard.
Pair it with the Generation Next/Embassy runs, some of my favorite stuff ever (especially on Shelley's end, playing a different sort of heel in each environment, calculating leader vs. total stooge), and all the Motor City Machine Guns stuff, genuinely one of the best tag teams of the last twenty years largely led by Shelley, and it's enough for me to at the very least put him into consideration. High chance he winds up on the final cut, even if it's the bottom ten to twenty.